Stop mechanism for sewing machines



Sept. 23, 1930*.

W. P. PAXTON STOP MECHANISM FOR SEWING MACHINES Filed Dec. *21. 192'?V 2 Sheets-Sheet l invento/o Sept. 23, 1930. w. P. PAxToN 1,775,478

l STOP MECHNISM vFOR SEWING MACHINES l Filed Deo. l, 1927 2 sheets-sheet 2 @noauto/z ff Pat-feav"sept.I 23,1930

g, @yMACH:Niang,.gCog,` or PADUCAH;KENTUCKY,l A CORPORATION or KENTUCKY j ivnoznivisiir roza SEWING Mncirnvns I v in ",-Thisinventionfrelates'to-,improvements in stop mechanisn,fory sewing 1 machines; the? L f present` embodiment ofthefinve'ntion beingL f particularly Vdesigned'and, adapted for use y f5 in connection With that class or typeof Sew- 1o befreadily attacheinfor-detached from the ordinaryorconventionalform' of dial loop`r f .er Without interfering vin any Way with the normal operation-ofthe latte'rf` "Ina the dial 'looperv machine, there is,y asfis i V'1 5 Well knovvmja thread Which'isfed to the nee-v Vdleo'fjthe'm'achin'e `and a' second 'thread that is :ted to theflooper `or:thatm'ember of 'the Y .v actualstitching devices which `forms aloop n throughvvhich the'needle thread is carried; v20 Stop mechanisms operable upon depletionfor fr breakage ofthis needlethrea'd-y have heretov y tore V'been proposed f but there Vhas,'u`sually,`

been no means forf rendering the stop mechanis'm operative vin the event vof breakageor i,

`2,5,L depletionE of thelooper thread. Forl this rea- `.son the present invention is more particularly directed to the provision of the stop mechanism that may' be rendered operativev upon depletion or breakagey oteitherthe'looper detector for deflection of the thread, sup

eolthreadf or the needle thread.

LMoreu specifically-,the present invention Vcontemplates the 'stop mechanism including atrip device normally'.supportedfin'inoperative'position on `the needle thread, said trip'beingfadapted to' fall by ygravityl to a position to render the stopmechanism' op-` erative upon breakageor, depletion ofthethreador'upon roccurrence of a knot in thev y thread. the thread breaks 'the trip 40 will, olf course,*be.free1 to falhand When a knot occurs intheithread said thread is'kdetiectedso as to movejfrombeneathA the trip, thereby permitting the Alatterto fall; yIn the present instance, rmeans are alsoprovided for i delectingjthe needle thread frombeneath said trip When tlieflooper thread breaks or becomes depleted. Preferably, this latter` jmeansconsists 'ofy a member Ipivoted intermediateits endsvvith/oneend supported onV 50jthelooperzthreadfandits opposite end positioned to engage and `deflectl the needle' thread vfrombeneath'the tripping device when the 'looper thread is broken ordepleted.

Yg.,WIT-Limit, lyiiSniTonLon, iaiiinUc-ni'71T,v KENTUCKY, yifissasrivfi'a `To SCTHERN TEXTILE f kTith thesevand'other objects in View the presentinvention consists in certain novel details of construction and combinations and f arrangements of parts,l all aswill behereiny after more fully described-and the novel fea-r tures thereof particularly pointed out in thel appended claims. n i f` In the accompanying drawings,--Vv "Figure 1 is atop plan view of a `sewing machine "ofthe dial looper typef'equipped With stopmechanism constructed in accordance with `the present invention, the yold 4o1" conventional machine parts being shownin dotted lines'.

Fig. 2 is atop plan View oli' the loop'eri equipped Withthe stop mechanism, the parts being shoWn'inA their connected, fully shifted, clutch releasing, position as upon the occurrence of a broken thread.y f y Fig; 3 is an vend elevation Cit' the attachment, showing the trip devices for rendering the stopmechanism operative. i 'FigL 4 is a side elevation ofthe parts shown in Fig. 3. y

Fig, 5 is a top planview of the same. F ig.` 6' isa perspective View of the knot porting the trip `device of the stop mechy ing arm l0 is mounted. The machine is proi vided ivith'suitable driving and clutchshifting mechanism consisting, in the present in stance, of a driving shaft-11 mounted on the bedplate and extendingthrough the base portion of the overhanging arm` 10 at right angles thereto. n Y The clutch driving. mechanism `)comprises relatively, circumferentially, Xed 'and mov able clutch members l2, 12a,urespectively, on

the end'of thedrivingsliatt ll. Longitudin'ally"movabler but Vcircumt'erentially fixed clutch member 12 is movable or shiftable byy means of a slide orshiftvmember 13 operat-` spaced' bearing Lmembers 15 adaptedtokbef Y tion may take the form of a vrod orshatt, jour;-v

, able on asuitable bearingsaiclcafm being pro- V positively moved to and from the relatively engaged anddisengaged positions by means of Van interposedfcam V16 horizontal-ly mov-A vided ivithsan actuating armjor lever 17 '.71 t Q .Theclutch shlftinginechanism includes ai.,A longitudinally f movable clutch v,Sluiter V18,

consisting p'refe-.rably4 of a shifter rod. extloncb ing forwardly' and" parallel Withl overhang# ing 'arm lQand supportedk in a suitable'guide bracket 19. V"As a meansforpositively actuating theclutch shifterincchanism Whenthe stop-mechanism hereinafter'referred to isl brought into action, lthe driving sli-ait; 1,1 providedatone-.side with the driveigwlieel- QQ which, in the present instance, is intheV form' vof a rotary.channel-shaped meinberhaving a driving pin orl projection 21. Thefclutch shifter memberor rod'ilSis also provided'witlif a sleeve or lprojectionhaving a stud 22 theref on adapted tok be engaged by the thread con@V trolledlink of .the stop mechanism ivhenisaidlink is engaged by the abutment or prof" jection 21 kof the drive WheelQO alias vrWil hereinafterfbe more' fully described.

A link-device adapted, Wlienain one posiy tion, to clearkthe` said',.driving` and clutch mechanism, and when iny anotherlposition, t0--` connectz therewith and shift said clutch mech'.- anisni to open the clutch to stop the driving mechanism, aswell as the various devicesconn ected therewitlnis provided, the same pref ierably Aconsisting ,ofl a longitudinally and Y' transversely movable link 23, Whose body por-l naled in suitable bearingse ofa'supporting Vand"attaching plate 25.' In the present instance, plate 25v is attached at the top with overhanginfr arm l()A by means of suitable fastening e einents such as ordinary screws. The rod or link 23 is readilymovablelongitudinally irritebearings and isy also Vtreeto be rocked or tilted through the control armsy orlevers to be now-described.` The relatively movablelink 23.' is' provided at one en 'd isvith Vadepending armor leverrQa and at the other end vWitlia,horizontally extending arrn or lever 23h, the latterextending above the clutchshifter and theprojection 22fcarried thereby, the positionfof saidflever 23h beingf suchthat when it is permitted to drop soin-ef Y what, as Willhereinaiter be described, it `vvill.

be in a position to engage Vsaid projection Q2;

23 is toone yside ofgthe'path oi' Inovcrneiit"of'.V the projection 21 on Wheel 2O and-itivillbe understood that lever Q/Slis in: a positron above projection 22,V as j ust described. -Tn

other Words, this is the inoperative position-y ottheconnections. c Asaineanstor holding the link 28 Withitsarmsor levers 423a and Q3? in thisl inoperative-'or'neutral position With respectgtoi the driving and clutch shiftingy tion, suitable threadcontr'olled ortrip mech-` anism is provided consisting, -in {the-present iff" instance, of. a cam'fmemb'e'r; :267.pivotallygwfgj mountedat one side of the attaching plateQj and; arranged toV lengage beneathzthe arm 23". Y

vic

liii4 sno-rm'al positonlniember 26% is adapted tosustain the arms 233.7and1'23 in their neuytrai-p'ositi ns, `(Fig. l)k and in another posi-ff 1 tionsardarrnsare -adapted to .bey enh,afgeclijbyY theproj'ectionZI and to-e'ngageandshift the clutchshifterf'l as shoWn inVK Fig. '2. This @ammette-fee maybe of any Suitable form., 'f

For instance, itmay. be formed as an' offset "portion cfa shaft' 26ajournaled in bearings 27 on f lthe .plate 25,said 'claim -or ,shaftv Abeing provided.' with( aihorizontally extending Y 128 having its tree end; normallysustainedorf supporaedk by the needlethread-29- at/azpoint just beyond where the-thread? passes throughiV the tensiondevice ordisk SOarrangedf oni/the;- di'skstud 31. The thread tension'devicernay y be of the usualconstructie-11, as show vn,V and m'ountedfon the usual tensionpost orzperl-estail- The' needle. thread 292 ai'ter. .p`assingi through tlietension diskBO and anV openingj'or y eyeiin ap'oste,carriedbyPedestal/lf3?, isp. c led Afrom. the tension t.clislrfil overa-qthrea-d-f: l '4 guide 35 after; whichv itispasse'd down" toe the Y sewingv mechanism. Il. By beingsoarranged au horizontal tra-uti portion!v 29a ics-5 maintained be-- tweenthethreadtension disk aindfthethread l guide 35y for conveniently? supporting ,the

- thread c'ontrolled'farni. 28foff theI camV member Y arrangementl it. will; bef appro, ciated that upon' depletir'inorbreakagev of the? `needle thread29 thearm'28 fof cani member74V 26v yWill b'eiiree to V falliby' gravity, ,turni-ngy the'A oliset Vportion of the cam memberQ asv indiv` it@ Y cated in Fig; 2', whereupon-the link member QSWill be free tofturnfin its bearingslto con-.-y neet the shifter rod 18- with the drivefwvhecl? 20 as also` illustrated in said ligure; @As ai means for causingthese partsto unctionin ..1 thesame lmanner `upon the occurrence of aj knotv in the need-le thread, athreadzcontrol-led;

sustaining tripfarm128,{inithe .eventi oit' al knotf l 40j coming into engagement with -f the knot; catcher, the thread controlledY orf actuated; Y member-26 is providedfi-atitsoppositeendg'V locatedv near tliearm` 28, with anuipvvardly'l andv outwardly disposed fthreadf interceptingi and ino vingf portion; All `Upona'engagera'entr i vso y shaft-is a threadr detlector 48.r Member '48 is pivoted intermediate its ends audits ofkiiot in the knot` catcher, member 36 Will- Vbe turned on itsl pivotal center'and its end fportion 41"r`aisedv with'v the result that ythe taut portion .29-otthe thread willbe vdetlected VA,tosiich any extent as toclear thel end `of the trip `arm v28, thereby vallowing the latter to dropy with result that the stop mechanism will y' fg-be renderedeperati've asin the 'case ot the -futhreadbecoming'depleted or broken. Practically all ofthe structure thus lfar described l is efully* shown :aiidfdescribed in Patent No.

Vff1,677,673,"dated,.Iiilyl'?, 1928, andassigned f, ltov applicantsassignee.

The mechanism heretofore described has to' do with rendering the stop mechanism operative upon depletion orghreakage of the needle thread or upon occurrence ot a knot inthat thread. In the lpresent construction,

' f however, additional means `are provided tor rendering this stop ,mechanism operative j upon depletion or breakage .of the looper i thread 42. .Asshowinr looper thread 42, is

passed through Van opening 43 in the post 34v and thence over the tension-disk44 on post ,31; From the tension'disk it'passes ovei' the l guide 45 and thenceto vanotheropening 46 V in post 44.- In this Way'a taut portion 4,2a

* y Vwith respect to the ytaut portion 29@L ot the vneedle thread that when the looper thread is brokeny or becomes depleted the end 49 of said is'- maintained between thev tension disk 44y and the guide 45.V Mountedfon the pedestal 32E is a stub shaft 47 and pivoted on said heavier end -49 normally rests on the taut por-K tion y421 of the looper thread 42, While its opposite and lighter end 50 is so positioned broken or depleted, thestop mechanism will be rendered operative by the falling'ot trip yarm 28 and,`likewise, upon occurrence of a yknot infthe needle thread, said stop mechal nism will also be vrend-ered operative.

`VVha-t I claim'is: y

l. In a sewing machine adapted to utilize fa needle thread and a looperthread, thecombination with a drive and drive control, of a stop motion mechanism comprisinga trip device having an element supported in inoperf,

Y ative position by the needle thread, and means engaging the looper thread and ymovable into engagement withthe needle thread upon de- 2./Inlasewing machine adapted to pletionV or breakage-ot the looper thread for ,defiecting the* needle .thread to a clear said'tripA device element.

position to utilize "inve-ava' al" needle thread and a looperlthread, the combination with a'jdrive and drive control'0t a stop i motion :mechanism .comprising V a trip device"iliavingr anv element supported inin. operative position "by the needle thread, and means supported by the looper` thread and,`

movabletol deiect the 'needle thread from beneath said trip devicel element upon breakage or depletion ofthe looperthread.Y

13. In asewingmachine adapt-ed a needlethread 'and a looper thread, the combination withthe drivefandgdrive control, ot a stop motion mechanism' comprising` a trip device adapted to be rendered operative upon depletion or breakage of the needle thread,

yandmeans engaging the looper thread at a point in kadvance ofthe needle and operable 'through' the needle thread to render said trip device operative upon depletion of the looper thread.

4. 'In a sewing machine adaptedy to utilize a needle thread and a looper thread, the cointo utilize binationfwith the drive and` drive control f mechanism, of astop motion mechanism including a thread control device orcontrollingV said drive control mechanism, said,

lthread control deviceembodying an element i normally supported inV neutral position by the needle thread, means engageable by a knot in the needle thread for deiiecting the said thread and moving it `'trom the position in which it normally supports saidelement, and means operable by gravity upon depletion or breakage of the looper thread for likewise ydeflectingv said needle thread.

5. Ina sewing inachineadapted toutilize a needle thread and a looper thread, the combination with the drive and drivccontrol, of

a stop motion mechanism comprising a trip devicehaving an element supportedin inoperative position by the needle thread,

thread deflecting means operable by occurrence ot a knot in the needle thread for moving said thread from the position in which it supports said trip device element, and a second thread deiiecting member supported at one end on the looper thread and movable by Vgravity upon depletion 0r breakage ot' said looper thread to move said needle thread from the position in which it normally supports said trip ydevice element( f 6. In aY sewing machine adaptedr to utilize a needle thread and a looper thread, the combination with the drive and drive control, of a stop mechanism comprising a trip device having an element supported in inoperative position by one of said threads, whereby said4 trip will be rendered operative upon depletion or breakage of the thread by which said element is normally supported, and means en- Y gaging the other threadin advance of the needle for rendering said trip operative upon breakage or depletion of said other thread.

' 7. In a sewing'machine adapted to utilize a needle thread and a looper thread, the com- Y binatom 'with drv and drive cntroh- `o/f -azstop .motion mecl'mmsmcomprlsmgqa tmp'.

. .Nv Ll v which it s supported, zt-hd means normally e114* gagngthe odlerthr'eadgand .movableinto d engagemntV Wlthzthe Hfst mentloned; thread 'atawpkomt ln'advance gj'-theneedle 0`1fren- 1 dering said element .operativeupon break-f age oldepletonfofdsaid other thread., f Y

' WILLIAM P.' PAXTON. 

